<?php
//dezend by http://www.yunlu99.com/ QQ:270656184
defined('BASEPATH') || exit('No direct script access allowed');
class CI_DB_ibase_forge extends CI_DB_forge
{
	/**
	 * CREATE TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_create_table_if = false;
	/**
	 * RENAME TABLE statement
	 *
	 * @var	string
	 */
	protected $_rename_table = false;
	/**
	 * DROP TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_drop_table_if = false;
	/**
	 * UNSIGNED support
	 *
	 * @var	array
	 */
	protected $_unsigned = array('SMALLINT' => 'INTEGER', 'INTEGER' => 'INT64', 'FLOAT' => 'DOUBLE PRECISION');
	/**
	 * NULL value representation in CREATE/ALTER TABLE statements
	 *
	 * @var	string
	 */
	protected $_null = 'NULL';

	public function create_database($db_name)
	{
		empty($this->db->hostname) || ($db_name = $this->hostname . ':' . $db_name);
		return parent::create_database('"' . $db_name . '"');
	}

	public function drop_database($db_name)
	{
		if (!ibase_drop_db($this->conn_id)) {
			return $this->db->db_debug ? $this->db->display_error('db_unable_to_drop') : false;
		}
		else if (!empty($this->db->data_cache['db_names'])) {
			$key = array_search(strtolower($this->db->database), array_map('strtolower', $this->db->data_cache['db_names']), true);

			if ($key !== false) {
				unset($this->db->data_cache['db_names'][$key]);
			}
		}

		return true;
	}

	protected function _alter_table($alter_type, $table, $field)
	{
		if (in_array($alter_type, array('DROP', 'ADD'), true)) {
			return parent::_alter_table($alter_type, $table, $field);
		}

		$sql = 'ALTER TABLE ' . $this->db->escape_identifiers($table);
		$sqls = array();
		$i = 0;

		for ($c = count($field); $i < $c; $i++) {
			if ($field[$i]['_literal'] !== false) {
				return false;
			}

			if (isset($field[$i]['type'])) {
				$sqls[] = $sql . ' ALTER COLUMN ' . $this->db->escape_identififers($field[$i]['name']) . ' TYPE ' . $field[$i]['type'] . $field[$i]['length'];
			}

			if (!empty($field[$i]['default'])) {
				$sqls[] = $sql . ' ALTER COLUMN ' . $this->db->escape_identifiers($field[$i]['name']) . ' SET DEFAULT ' . $field[$i]['default'];
			}

			if (isset($field[$i]['null'])) {
				$sqls[] = 'UPDATE "RDB$RELATION_FIELDS" SET "RDB$NULL_FLAG" = ' . ($field[$i]['null'] === true ? 'NULL' : '1') . ' WHERE "RDB$FIELD_NAME" = ' . $this->db->escape($field[$i]['name']) . ' AND "RDB$RELATION_NAME" = ' . $this->db->escape($table);
			}

			if (!empty($field[$i]['new_name'])) {
				$sqls[] = $sql . ' ALTER COLUMN ' . $this->db->escape_identifiers($field[$i]['name']) . ' TO ' . $this->db->escape_identifiers($field[$i]['new_name']);
			}
		}

		return $sqls;
	}

	protected function _process_column($field)
	{
		return $this->db->escape_identifiers($field['name']) . ' ' . $field['type'] . $field['length'] . $field['null'] . $field['unique'] . $field['default'];
	}

	protected function _attr_type(&$attributes)
	{
		switch (strtoupper($attributes['TYPE'])) {
		case 'TINYINT':
			$attributes['TYPE'] = 'SMALLINT';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'MEDIUMINT':
			$attributes['TYPE'] = 'INTEGER';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'INT':
			$attributes['TYPE'] = 'INTEGER';
			return NULL;
		case 'BIGINT':
			$attributes['TYPE'] = 'INT64';
			return NULL;
		default:
			return NULL;
		}
	}

	protected function _attr_auto_increment(&$attributes, &$field)
	{
	}
}

?>
